CrosshairFormatterCallback (Charba - J2CL and GWT charts library based on CHART.JS)

```
public interface CrosshairFormatterCallback
```
This callback is the interface to defined customized representation of the labels in Crosshair.ID plugin.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`format(IsChart chart, ScaleItem scale, ScaleValueItem value)`	Returns the text to apply to the crosshair label.

- Method Detail
  - format
```
String format(IsChart chart,
              ScaleItem scale,
              ScaleValueItem value)
```
    Returns the text to apply to the crosshair label.
    
    Parameters:
    
    chart - chart instance
    
    scale - scale instance
    
    value - current value to draw in the label
    
    Returns:
    
    the text to apply to the crosshair label